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            <div class="header-open">分布式关系型数据库服务<span style="color:#90b8f1;font-size:14px"></span><p style="width:260px;">
              Distributed Relational Database Service</p></div>
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              Resource Access Management (RAM) 是阿里云为客户提供的一种集中式用户管理与访问控制服务。通过该服务，资源属主可以集中管理用户（包括企业雇员、应用系统或合作伙伴）对资源的操作权限，以满足多种应用场景的苛刻安全管理需求。
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              Security Token Service (STS) 是阿里云为客户提供的一种安全令牌服务，它是RAM服务的功能扩展。通过该服务，客户可以给那些偶尔操作云资源的终端用户（或不受信用户）颁发短时有效的访问令牌，以满足某些应用场景的最小权限要求。
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              集中管控——集中管理所有用户对所有资源的操作权限
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             精细控制——自定义授权策略对指定的资源进行指定的API操作 
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             多重限制——授权生效条件受源IP地址、访问时间等多重因素限制 
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             管控灵活——满足客户最精细、最苛刻的安全管理要求
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             快速便捷——授予或撤销权限后全球所有区域即刻生效
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             稳定可靠——全区域部署、追求100%可用性目标 
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            授权您的企业员工或应用系统操或本地域账号作您的云资源
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             授权您的移动App的终端用户操作您的云资源
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            授权合作企业云账号操作您的云资源
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            授权阿里云服务操作您的云资源
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            授权云市场第三方应用操作您的云资源
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            <span class="span7">更多场景请访问www.aliyun.com
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